Monday, October 8, 2012

Solving Plane Geometry

Introduction to solving plane geometry:

Geometry is one of the important parts of mathematics deals with properties of shape of geometric objects. Geometry used to say all kinds of shapes and their properties. There are two major classifications in geometry. They are Plane geometry and Solid geometry. Shapes that are drawn at flat surface are called Plane and the study about this is called  Plane geometry. Plane geometry is about the shapes of lines, circles, etc. Plane geometry is study about two-dimensional objects.

Problems on Solving Plane Geometry:

Problem 1:

Solving the area of the triangle with the base of 7cm and the height is 10cm.

Solution:

Given:       Base = 7cm

Height = 10cm

Area = (b * h) / 2                       

= (7 * 10) / 2                            

= 70 / 2

= 35 cm^2

Problem 2:

Solving the area of the circle with 10.5cm radius.

Solution:

Given:     Radius = 10.5cm

Area of the circle =`pi` r2

= 3.14 * 10.5 * 10.5

= 346.18cm^2

Problem 3:

Solving the area of the trapezoid whose length is 10 cm, the width is 5cm and the height is 10 cm.

Solution:

Given:   Length = 10cm

Width = 5cm

Height = 10cm

Area = h (l + w) / 2                                                                                                                

= 10 (10+5) / 2

= 150 / 2

= 75cm3

Problem 4:

Solving the area of the rectangle with length 6.5cm and width 3.5cm. Also find its perimeter.

Solution:

Given:    Length = 6.5cm

Width = 3.5cm

Area = L * W

= 6.5 * 3.5

= 22.75cm^2            

Perimeter = Sum of all sides

= 2L + 2W

= 2 * 6.5 + 2 * 3.5

= 13 + 7

= 20cm^2

Problem 5:

Solving the area and perimeter of the parallelogram whose Height 12 cm, length 14cm, width 16cm.

Solution:

Given:    Length = 14cm

Width = 16cm

Height = 12cm

Area = L * W

= 14 * 16

= 224cm^2

Perimeter = Sum of all sides

= L + W + H

= 14+16+12

= 42cm3


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Practice Problems on Solving Plane Geometry:


1.   Find the area of the trapezoid whose length is 3 cm, the width is 1.5cm and the height is 5cm.

Answer:  11.25cm^3

2.  Find the area of the circle with 0.5cm radius.

Answer:  0.785cm^2

3.  Calculate the area and perimeter of the rectangle whose length is 2cm, width is 2.5cm.

Answer:   Area = 5cm^2
Perimeter = 9cm^2

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